Is the orbit of the exoplanet WASP-43b really decaying? TESS and MuSCAT2 observations confirm no detection
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Oxford University Press
Methods: observationalTechniques: photometricPlanets and satellites: individualWASP-43b
Z Garai, T Pribulla, H Parviainen, E Pallé, A Claret, L Szigeti, V J S Béjar, N Casasayas-Barris, N Crouzet, A Fukui, G Chen, K Kawauchi, P Klagyivik, S Kurita, N Kusakabe, J P de Leon, J H Livingston, R Luque, M Mori, F Murgas, N Narita, T Nishiumi, M Oshagh, Gy M Szabó, M Tamura, Y Terada, N Watanabe, Is the orbit of the exoplanet WASP-43b really decaying? TESS and MuSCAT2 observations confirm no detection, Monthly Notices of the Royal Astronomical Society, Volume 508, Issue 4, December 2021, Pages 5514–5523, [https://doi.org/10.1093/mnras/stab2929]
SponsorshipErasmus+ grant 2017-1-CZ01-KA203-035562; VEGA grant of the Slovak Academy of Sciences 2/0031/18; ESA PRODEX grant; ELTE University; National Research, Development & Innovation Office (NRDIO) - Hungary 2.3.2-15-2016-00003; City of Szombathely 67.177-21/2016; National Aeronautics & Space Administration (NASA) NAS 5-26555; Gaia Multilateral Agreement; Spanish Ministry of Economics and Competitiveness PGC2018098153-B-C31; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research (KAKENHI) JP17H04574 JP18H01265 JP18H05439; JST PRESTO grant JPMJPR1775; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science JP20J21872; Slovak Research and Development Agency APVV-20-0148; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research (KAKENHI) 18H05442 15H02063 22000005; State Agency for Research of the Spanish MCIU through the 'Center of Excellence Severo Ochoa' award for the Instituto de Astrophysics of Andalusia SEV-2017-0709; European Research Council under the European Union's Horizon 2020 research and innovation program 694513
Up to now, WASP-12b is the only hot Jupiter confirmed to have a decaying orbit. The case of WASP-43b is still under debate. Recent studies preferred or ruled out the orbital decay scenario, but further precise transit timing observations are needed to definitively confirm or refute the period change of WASP-43b. This possibility is given by the Transiting Exoplanet Survey Satellite (TESS) space telescope. In this work, we used the available TESS data, multicolour photometry data obtained with the Multicolor Simultaneous Camera for studying Atmospheres of Transiting exoplanets 2 (MuSCAT2) and literature data to calculate the period change rate of WASP-43b and to improve its precision, and to refine the parameters of the WASP-43 planetary system. Based on the observed-minus-calculated data of 129 mid-transit times in total, covering a time baseline of about 10 yr, we obtained an improved period change rate of (P)over dot = -0.6 +/- 1.2 ms yr(-1) that is consistent with a constant period well within 1 sigma. We conclude that new TESS and MuSCAT2 observations confirm no detection of WASP-43b orbital decay.